NFS: Add version registering framework

This patch adds in the code to track multiple versions of the NFS
protocol.  I created default structures for v2, v3 and v4 so that each
version can continue to work while I convert them into kernel modules.
I also removed the const parameter from the rpc_version array so that I
can change it at runtime.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 65327652c61a..6039297801f4 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -48,6 +48,7 @@ struct nfs_client {
         struct rpc_clnt *       cl_rpcclient;
         const struct nfs_rpc_ops *rpc_ops;      /* NFS protocol vector */
         int                     cl_proto;       /* Network transport protocol */
+        struct nfs_subversion * cl_nfs_mod;     /* pointer to nfs version module */
 
         u32                     cl_minorversion;/* NFSv4 minorversion */
         struct rpc_cred         *cl_machine_cred;